Crazy eyes: first complete prototype test

After a long time parked, I took this project again and put the things together to do a first test moving the servos with the tracking data.
The IR illumination system has a lot to improve, but so far the tracking is working fine.




Video recorded by Xavi Selvi

Avoid arduino resets caused by servo current spike

Dealing with relatively high torque servo motors powered by the USB port or a power bank through the arduino board may cause a current spike that lowers the voltage and makes the arduino reset... keep reading for a solution for this problem.

Halogen floodlight SMT reflow

This project was waiting on a box fot two years, until I had to solder 100 PCBs. After some research on SMD/SMT reflow oven hacking, I was confident to build my own reflow device with an halogen floodlight.

Valentia Case-Rap foldable 3D printer

In the summer of 2016, browsing in Thingiverse I came across the Case-Rap 1.0 foldable 3D printer by jlguils. I liked the design strategy of dividing the structure in parts that, when folded, transformed themselves into a portable case. And started to develop my own custom version: the Valentia Case-Rap foldable 3D printer.

Mysterious z ribbing with PLA... solved!

I've been having consistent z ribbing on different custom printers since a year or so...
No matter what I've tried (z wobble isolator, z axis strabilizer, threaded rod diameter/pitch changed, etc.).
Yesterday my heated bed's MOSFET failed while printing yet another calibration cube and guess what... NO Z RIBBING!!!

Arduvision (II): OV7670 + FIFO module and arduino Mega

After several people asking for instructions to use an Arduino Mega to interface the ov7670 sensor, I decided to publish a tutorial about it...

Simple passive mono/stereo to stereo audio mixer circuit

A while ago I needed a very simple pasive miker to join one stereo and two mono signals together before amplifying them...

There is some mixed information on how to properly connect a mono signal to a stereo input, but most of it uses active mixing.